Vent Hood For Nominal Duct Diameter 3 in Gas Appliance Category Category I For Duct Height 6 1/4 in For Duct Width 6 1/4 in Inlet Diameter 3 in Material Aluminum Overall Length 7 3/4 in Product Type Vent Hood Inside Diameter 3 in Material Thickness 20 ga Weight 4 lb Maximum Pressure Rating Not Applicable Maximum Temperature Rating 575 Degrees F Seal Material Not Applicable Standards Not Applicable Finish Flat Color Silver Overall Height 5 1/4 in Shape Rectangular Round